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annotate src/logerr.h @ 5526:b1a3d9055662 draft

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privsep: Allow logfile reopening in a chroot Now that only the privileged actioneer does the actual logging we can safely reopen the file we are logging to. This also closes and re-opens the syslog connection.
author Roy Marples <roy@marples.name>
date Fri, 30 Oct 2020 14:19:16 +0000
parents 26b5d9bc2985
children 071a9ea18363
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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c7df03794de3 Add SPDX identifiers to all dhcpcd source files.
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1 /* SPDX-License-Identifier: BSD-2-Clause */
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2 /*
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3 * logerr: errx with logging
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555d7d1a4939 Welcome to 2020!
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4 * Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
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5 * All rights reserved
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6
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #ifndef LOGERR_H
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30 #define LOGERR_H
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31
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32 #include <sys/param.h>
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33
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34 #ifndef __printflike
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35 #if __GNUC__ > 2 || defined(__INTEL_COMPILER)
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36 #define __printflike(a, b) __attribute__((format(printf, a, b)))
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37 #else
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38 #define __printflike(a, b)
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39 #endif
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40 #endif /* !__printflike */
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41
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42 /* Please do not call log_* functions directly, use macros below */
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43 __printflike(1, 2) void log_debug(const char *, ...);
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44 __printflike(1, 2) void log_debugx(const char *, ...);
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45 __printflike(1, 2) void log_info(const char *, ...);
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46 __printflike(1, 2) void log_infox(const char *, ...);
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47 __printflike(1, 2) void log_warn(const char *, ...);
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48 __printflike(1, 2) void log_warnx(const char *, ...);
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49 __printflike(1, 2) void log_err(const char *, ...);
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50 __printflike(1, 2) void log_errx(const char *, ...);
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51 #define LOGERROR logerr("%s: %d", __FILE__, __LINE__)
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52
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53 __printflike(2, 3) void logmessage(int pri, const char *fmt, ...);
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54 __printflike(2, 3) void logerrmessage(int pri, const char *fmt, ...);
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55
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56 /*
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57 * These are macros to prevent taking address of them so
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58 * __FILE__, __LINE__, etc can easily be added.
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59 *
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60 * We should be using
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61 * #define loginfox(fmt, __VA_OPT__(,) __VA_ARGS__)
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62 * but that requires gcc-8 or clang-6 and we still have a need to support
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63 * old OS's without modern compilers.
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64 *
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65 * Likewise, ##__VA_ARGS__ can't be used as that's a gcc only extension.
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66 *
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67 * The solution is to put fmt into __VA_ARGS__.
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68 * It's not pretty but it's 100% portable.
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69 */
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70 #define logdebug(...) log_debug(__VA_ARGS__)
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71 #define logdebugx(...) log_debugx(__VA_ARGS__)
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72 #define loginfo(...) log_info(__VA_ARGS__)
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73 #define loginfox(...) log_infox(__VA_ARGS__)
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74 #define logwarn(...) log_warn(__VA_ARGS__)
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75 #define logwarnx(...) log_warnx(__VA_ARGS__)
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76 #define logerr(...) log_err(__VA_ARGS__)
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77 #define logerrx(...) log_errx(__VA_ARGS__)
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78
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79 /* For logging in a chroot */
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80 int loggetfd(void);
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81 void logsetfd(int);
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82 int logreadfd(int);
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83
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84 unsigned int loggetopts(void);
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85 void logsetopts(unsigned int);
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86 #define LOGERR_DEBUG (1U << 6)
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87 #define LOGERR_QUIET (1U << 7)
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88 #define LOGERR_LOG (1U << 11)
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89 #define LOGERR_LOG_DATE (1U << 12)
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90 #define LOGERR_LOG_HOST (1U << 13)
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91 #define LOGERR_LOG_TAG (1U << 14)
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92 #define LOGERR_LOG_PID (1U << 15)
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93 #define LOGERR_ERR (1U << 21)
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94 #define LOGERR_ERR_DATE (1U << 22)
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95 #define LOGERR_ERR_HOST (1U << 23)
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96 #define LOGERR_ERR_TAG (1U << 24)
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97 #define LOGERR_ERR_PID (1U << 25)
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98
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99 /* To build tag support or not. */
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100 //#define LOGERR_TAG
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101 #if defined(LOGERR_TAG)
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102 void logsettag(const char *);
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103 #endif
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104
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105 int logopen(const char *);
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106 void logclose(void);
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107 int logreopen(void);
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108
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109 #endif